Ole Sigmund

Spectrally smooth broadband response via autocorrelation-constrained inverse design

Johannes Gedeon, Rasmus E. Christiansen, Ole Sigmund

Time-domain inverse design in photonics is known to be suitable for maximizing the efficiency of optical devices over broad frequency ranges. Objectives commonly used in this context include time-integrated field quantities derived from Poynting's theorem, such as energy, flux, or dissipated power, …

Towards robust topology optimization by penalization of sensitivity hot spots

Ole Sigmund

Abstract An alternative and cheaper way of designing structures with reduced sensitivity to manufacturing variations and uncertainties in topology optimization is investigated. Established robustness schemes involve optimizing with multiple design realizations, stochastic gradients or complex perturbations approaches. Motivated by the observation that …

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A Matlab code for analysis and topology optimization with Third Medium Contact

Andreas Henrik Frederiksen, Ole Sigmund, Federico Giorgio Ferrari

Abstract We present a code for modelling and topology optimization of hyperelastic structures, including contact modelled by the Third Medium Contact (TMC) approach. By using the so-called -regularization we penalize the skew distortion of the bilinear finite elements discretizing void regions, thus …

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Supplementary document for Tailoring robust photonic components using stochastic topology optimization - 7952922.pdf

Philip Elbek, Rasmus Christiansen, Niels Aage, Ole Sigmund

Supplemental document containing several figures.

Supplementary document for Tailoring robust photonic components using stochastic topology optimization - 7952922.pdf

Philip Elbek, Rasmus Christiansen, Niels Aage, Ole Sigmund

Supplemental document containing several figures.

Supplementary document for Tailoring robust photonic components using stochastic topology optimization - 7952922.pdf

Philip Elbek, Rasmus Christiansen, Niels Aage, Ole Sigmund

Supplemental document containing several figures.

Designing 2D cellular materials for brittle fracture initiation resistance via topology optimization

Sukhminder Singh, Ole Sigmund

This study introduces a density-based topology optimization framework designed to maximize the mode-I brittle fracture resistance of periodic two-dimensional cellular materials. By incorporating near-tip stress analysis of a tessellated domain containing a fixed crack subjected to K -field loading, the method optimizes …

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Tailoring robust photonic components using stochastic topology optimization

Philip Elbek, Rasmus E. Christiansen, Niels Aage, Ole Sigmund

Nanophotonic systems that rely on strong resonances or near-unity transmission through individual components are highly sensitive to geometric imperfections introduced during fabrication. To address this challenge, we present a stochastic topology optimization framework for designing photonic devices that are inherently robust to …

Novel insights into Pareto fronts in multiobjective topology optimization and a comparative study of scalarization strategies

Tom De Weer, Ole Sigmund, Gabriele Eichfelder

Topology optimization seeks structures that minimize an objective function subject to constraints. While extensive research has focused on single-objective formulations, design is usually a trade-off between conflicting criteria. This naturally leads topology optimization to the multiobjective optimization field. Unfortunately, despite their long …

Novel insights into Pareto fronts in multiobjective topology optimization and a comparative study of scalarization strategies

Tom De Weer, Ole Sigmund, Gabriele Eichfelder

Topology optimization seeks structures that minimize an objective function subject to constraints. While extensive research has focused on single-objective formulations, design is usually a trade-off between conflicting criteria. This naturally leads topology optimization to the multiobjective optimization field. Unfortunately, despite their long …

Free-form thermal cloaks in three dimensions

Weichen Li, Yibo Wang, Ole Sigmund, Xiaojia Shelly Zhang

Cloaking from environmental detection has been a central goal in thermal engineering. The transformation theory has predicted its existence, requiring graded and highly anisotropic material properties. Its realization with general geometry was achieved recently in the two-dimensions. However, engineering free-form omnidirectional thermal …

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Efficient First‐Principles Inverse Design of Nanolasers

Beñat Martinez de Aguirre Jokisch, Alexander Cerjan, Rasmus E. Christiansen, Jesper Mørk et autres

ABSTRACT We develop and demonstrate a first‐principles approach, based on the nonlinear Maxwell–Bloch equations and steady‐state ab‐initio laser theory (SALT), for inverse design of nanostructured lasers, incorporating spatial hole‐burning corrections, threshold effects, out‐coupling efficiency, and gain diffusion. The resulting figure of merit …

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